Bell pepper (Capsicum annuum L.) cultivation in the protected areas and greenhouses often take place without considering crop rotation,which resulting in soil pests and diseases. In order to reduce this problem, vegetable grafting apeared as one of the alternative solution. The aim of our study was to compare the yield, morphological traits of fruit (lenght and width of fruit, total soluble solids and fruit colour), as well as the content of individual sugars, organic acids and phenolic compounds, and also the total sugars and acids content and the sugar/acid ratio, in fruits of grafted and ungrafted plants of three bell pepper cultivars 'Bagoly', 'Belladonna' and 'Red Knight', which were grafted onto 'Scarface' rootstock. We found positive effect of grating onto average fruit mass only with cv. 'Red Knight', and at this cultivars the total yield was lower at grafted plants compared to ungrafted plants. Grafting had no effect of morphological traits of fruits in any of tested cultivars. Grafting increase the pericarp thickness of fruits of cvs. 'Bagoly' and 'Belladonna' and had positive effect on the content of glucose and fructose in fruits of bell pepper of 'Bagoly'. Grafting had no or negative effect on the content of sucrose. Grafting didn't affected the content of malic, citric, shikimic and ascorbic acid in fruits of at all tested cultivars. On the content of fumaric acid, grafting influenced negatively, but only at cv. 'Red knight'. At other cultivars, no significant impact of grafting on fumaric acid content was found.
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